克卜勒70

克卜勒70
Kepler-70
KOI-55
觀測資料
曆元
星座 天鵝座[1][note 1]
星官
赤經 19h 45m 25s[1]
赤緯 +41° 5′ 34″[1]
視星等（V） 14.87[2]
特性
光谱分类sdB[1]
视星等 (U)13.80[2]
视星等 (B)14.71[2]
视星等 (R)15.43[2]
视星等 (I)15.72[2]
视星等 (J)15.36[2]
视星等 (H)15.59[2]
天体测定
距离3849 ± 310[1] ly
(1180 ± 95[1] pc)
绝对星等 (MV)4.51[note 2][來源請求]
詳細資料
質量0.496 ± 0.002[1] M☉
半徑0.203 ± 0.007[1] R☉
溫度27,730 ± 260[1] K
其他命名
2MASS J19452546+4105339, CMC14 J194525.4+410533, GSC2.3 N2IY060737, KIC 5807616, KOI-55, KPD 1943+4058, UCAC2 46165657, UCAC3 263-170867, USNO-B1.0 1310-00349976.[2]

克卜勒70（Kepler-70），舊稱KOI-55，是一個位於天鵝座的恆星，視星等14.87[2]。該恆星必須使用口徑40公分以上望遠鏡才能觀測到[3]。

恆星狀況

克卜勒70是B型次矮星，大約在1840萬年前進入紅巨星階段。該恆星現在的狀況是核心正在進行氦的核融合，一旦核心中的氦用盡，它將會收縮變成白矮星。它的半徑是0.2倍太陽半徑，而白矮星的半徑則相當小[4]。

行星系統

克卜勒70旁已經發現兩顆行星：克卜勒70b和克卜勒70c[5]。而這兩顆行星是經由偵測行星本體反射的光而發現，並非以凌日法發現。

有觀測指出可能有第三顆更小的行星在已確認的兩顆行星之間，但尚未確認。

KOI-55的行星系[5]
成員
(依恆星距離) 		质量 半長軸
(AU) 		轨道周期
(天) 		離心率 傾角 半径
b 0.440 M⊕ 0.0060 0.2401 — — 0.759 R⊕
d (未确认) 0.222 M⊕ 0.0065  ? ?
c 0.655 M⊕ 0.0076 0.34289 — — 0.867 R⊕

注釋

  1. ^ 這是由KOI-55的赤經和赤緯確定。
  2. ^ 請參見星等了解進一步訊息。

參考資料

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Notes for Planet KOI-55 b. Extrasolar Planet Database. [1 January 2012]. （原始内容存档于2012年10月5日）. 
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 SIMBAD query result. SIMBAD. [1 January 2012]. （原始内容存档于2014-12-13）. 
  3. ^ Sherrod, P. Clay; Koed, Thomas L., A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations, Astronomy Series, Courier Dover Publications: 9, 2003 [2012-03-02], ISBN 0486428206, （原始内容存档于2014-01-04） 
  4. ^ Cain, Fraser. White Dwarf Stars. Universe Today. 4 February 2009 [8 January 2012]. （原始内容存档于2012-03-15）. 
  5. ^ 5.0 5.1 Charpinet, S.; et al, A compact system of small planets around a former red-giant star, Nature, December 21, 2011, 480: 496–499, doi:10.1038/nature10631 

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